James baxendale



sauras JAMES BAXENDALE, OF FALL RIVER, MASSACHUSETTS, ASSIGNORTO J.`ABAXENDALE AND lIAS. FERGUSON.

QEOBEMTINGTHE Dooren-s or camco-:PRINTING crtnvimrts` Speccationof Letters Patent 10,719, dated March 28, `1854:.

\ To all whom t may concern.'

Be it known t-hat I, JAMES BAXENDALE, of Fall River, in the county of Bristol and State of Massachusetts, have invented a new and useful Method or Contrivance for Operating the `Doctors of Calico-Printing Cylinders, which invention may be` denominated an Irregular Traverse-Motion and I do herebydeclare that the same is; fully described and represented in the following specification and the accompanying drawings, letters, figures, and references thereof.

Of the said drawings Figure 1, denotes an end view of the said invention. Fig. 2, a vertical and central section of it, taken in line of its axis. Fig. 3, is a view of the arrangement, of its pinion and eccentric gears. y

The object of my invention is to produce an irregular traverse motion of the doctor I of a calico printing cylinder, in order to prevent the usual injury to the engraved surface that results from the usual regular traverse movements thereof. As the doctor is moved with a reciprocating motion constantly between and up to two given points or bounds, there is shortly produced, an injurious wear on the engraved. surface, of the printing cylinder, the nature of which is well known to calico printers. My invention not only causes the doctor to be moved with a reciprocating motion, but it continually effects a change in the extent thereof, so that the doctor when moving in either direction never is arrested or brought to a stop at precisely the same spot or place where it was brought up to a stop during its next preceding movement.

\ I-Iaving thus vstated the purpose of my invention I shall now proceed to explain its nature and operation.

In the drawings, A B, represent two metallic plates or disks placed at a suitable distance asunder, and connected by three or any other suitable number of cross bolts" or bars, c, c, &c., which are to be so made and applied as to keep the plates apart and hold them in place. The rear pla-te or disk, is to be affixed on the axle of the blanket roller or that of some other roll-er of the calico printing machine to which a regular rotary motion is imparted during the working of the said machine. The said axle is to pass 5 centrally through the plate, A, and be fastened to it so as to cause the plate to be revolved with and by it whenit is put in revolution.

On three stationary ournals or pins D, E, F, projecting inward from the inner sur face of the plate B, and 'fastened to such plate, three spur gears Gr, H, I, are made to revolve. The centers of their journals are arranged respectively in the vertices of an equilateral triangle, and they are each placed a like distance eccentrically to the centers of the gear wheels. Fig. 4, is a diagram which serves to exhibit the disposition of the journals with respect to the centers of the wheels. In this ligure, a, b, and c, may be supposed to exhibit the respective centers or axes of the wheels, G, I-I, I; and d, e, f, to be the centers or axes of their respective journals. The centers of the journals are placed at the same distance, a d, c, or c f, from their centers, a, b, c, the distances, a d, b e, c f, being supposed to be taken on parallel lines. f Between the said three gears, Gr, I-I, I, is a pinion gear, K, whose teeth are made to engage with those of each of the three spur wheels. This pinion gear is fixed on a shaft, L, which extends through a hole, M, bored centrally through the plate, B, larger in diameter than the shaft and sufficiently so to allow the shaft to play freely in accordance with the compound movement which is imparted to it by the eccentric gear. The shaft-is kept in place by two beads or strong checks, or circular heads N, O, that are respectively fastened on it, and made to rest against the opposite surfaces or sides of the plate, B, as seen in the drawings.

The outer end of the connecting rod of the rocker shaft of the doctor or set of doctors is to be firmly fixed to the shaft, L, so that such shaft shall not revolve in such end, and so that the movements of the shaft shall be effected by the movements imparted to the pinion gear. The pinion gear therefore does not revolve consequently during the rotary movements of the plates A, B. They not only cause the three eccentric gears to rotate around the pinion gear, but to rotate on their respective journals or spindles. Now as their spindles are fixed firmly in the plate, B, and the latter rotates only on its center or axis, the necessary result will be that the pinion `gear must have imparted to it a constantly variable reciprocating ino-vement, whereby such a movement w-ill be imparted to the doctor. The movement is not only a reciprocating one, but its limits are constantly varying.

The common traverse motion produced by a crank or an eccentric is maintained within certain limits, which limits are constant, the doctor continually working up to land between them. But with my invention the limits of reciprocating motion are constantly changed in position, and by means of such,

- the doctor is lenabled to work on the engraved surface of the printing cylinder, without producing' the injurious consequences that result from its always stopping and starting from one spot, as is the case, when the motion is given by a crank or an eccentric.

The black, red, and blue circles in Fig.

4, serve to illustrate the rela-tive positions of the pitch circles of the four gears, during each third part of a revolution of one of the eccentric gears.

I claim as my invention- A compound traverse mechanism constructed of eccentric gears, and a pinion gear and a supporting frame, substantially as described as applied for obtaining a compound traverse or constantly variable reciprocating movement of the doctor of a calico printing roller.

In testimony whereof I have hereto set A my signature this twentieth day of October JAMES BAXENDALE.

Witnesses:

LOUIS LAPHAM, ALMANZA S. LINDSEY.

Jil 

